An electronic device is to be cooled in air at 20?C by an array of equally spaced vertical rectangular fins as shown in the sketch below. The fins are made of aluminum and their average temperature, Ts, is 100?C.Estimate(a) The optimum spacing, s(b) The number of fins(c) The rate of heat transfer from one fin(d) The total rate of heat dissipation(e) Is the assumption of a uniform fin temperature justified?GIVENElectronic device with vertical aluminum fins in airAir temperature (T??) = 20?CAverage fin temperature (Ts) = 100?CASSUMPTIONSSteady stateUniform fin temperatureThe air is stillHeat transfer from the top and bottom of the fins is negligibleThe heat transfer coefficient on the wall area between the fins is approximately the same as on thefins

0.3 m 20 mm T,- 100'C t=1 mm 0.15 m